Abstract
Citrate coated magnetite nanoparticles (NPs) were prepared by a modified coprecipitation technique in the presence of sodium citrate and sodium acetate. The citrate coated NPs showed a close particle size distribution, superparamagnetic behavior, and single crystalline nature. Water dispersions of magnetite NPs were analyzed by laser diffraction; this technique revealed that the NPs form micrometer sized aggregates. It was found that the size of the aggregates depends strongly on the time of ultrasonic agitation and the citrate shell.
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